Syntax error in NSM

[elmo second <elmosecond () hotmail com>]

I understand there is an issue importing Snort rules into McAfee NSM. I am trying to import a rule to alert for FTP 
anonymous: alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"POLICY-OTHER FTP anonymous login attempt"; 
flow:to_server,established; content:"USER"; fast_pattern:only; pcre:"/^USER\s+(anonymous|ftp)[^\w]*[\r\n]/smi"; 
metadata:ruleset community, service ftp; classtype:misc-activity; sid:553; rev:13; ) I am receiving a syntax error.Any 
assistance appreciated. Elmo

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